US8345200B2 - Liquid crystal display device having organic alignment layer and fabrication method thereof - Google Patents
Liquid crystal display device having organic alignment layer and fabrication method thereof Download PDFInfo
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- US8345200B2 US8345200B2 US13/253,769 US201113253769A US8345200B2 US 8345200 B2 US8345200 B2 US 8345200B2 US 201113253769 A US201113253769 A US 201113253769A US 8345200 B2 US8345200 B2 US 8345200B2
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title description 21
- 238000004519 manufacturing process Methods 0.000 title description 7
- 239000000758 substrate Substances 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims description 61
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- GAUFJJIOFOJVOP-UHFFFAOYSA-N n-(3-trimethylsilylpropyl)pyridine-4-carboxamide Chemical compound C[Si](C)(C)CCCNC(=O)C1=CC=NC=C1 GAUFJJIOFOJVOP-UHFFFAOYSA-N 0.000 claims description 2
- YRUJXAGQQTXCKX-UHFFFAOYSA-N 15-sulfanylpentadecanoic acid Chemical compound OC(=O)CCCCCCCCCCCCCCS YRUJXAGQQTXCKX-UHFFFAOYSA-N 0.000 claims 1
- -1 (trimethylsilyl)propyl Chemical group 0.000 description 28
- VFQXVTODMYMSMJ-UHFFFAOYSA-N isonicotinamide Chemical compound NC(=O)C1=CC=NC=C1 VFQXVTODMYMSMJ-UHFFFAOYSA-N 0.000 description 27
- 239000010408 film Substances 0.000 description 20
- 239000010410 layer Substances 0.000 description 19
- 125000001165 hydrophobic group Chemical group 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000002094 self assembled monolayer Substances 0.000 description 7
- 239000013545 self-assembled monolayer Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 4
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- 150000002894 organic compounds Chemical class 0.000 description 3
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- 230000005611 electricity Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- QHTRZAFJVUULEE-UHFFFAOYSA-N C.C[Si](C)(C)CNC(=O)c1ccncc1 Chemical compound C.C[Si](C)(C)CNC(=O)c1ccncc1 QHTRZAFJVUULEE-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000813 microcontact printing Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/56—Aligning agents
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133719—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films with coupling agent molecules, e.g. silane
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
- C09K2323/023—Organic silicon compound, e.g. organosilicon
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/06—Substrate layer characterised by chemical composition
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133765—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers without a surface treatment
Definitions
- the present invention relates to a display device, and more particularly, to an liquid crystal display (LCD) device and a fabrication method thereof.
- LCD liquid crystal display
- the present invention is suitable for a wide scope of applications, it is particularly suitable for an organic alignment layer for aligning liquid crystal molecules without rubbing.
- an LCD device is a display device for displaying images by controlling a transmittance of light through a liquid crystal layer by using refractivity anisotropy of liquid crystal molecules.
- an alignment In order to obtain uniform brightness and a high contrast ratio in the LCD device, an alignment must be performed so as to align the liquid crystal molecules in a predetermined direction.
- an alignment method by rubbing is commonly used. According to the alignment method by rubbing, an alignment film made of a material, such as polyimide, etc., is coated on a substrate, which is then rubbed by using a rubbing roll having an alignment cloth. Thus, uniform micro-grooves are formed on the surface of the alignment film. Liquid crystal molecules are arranged in parallel to the micro-grooves on the surface of the alignment film so as to minimize elastic deformation energy.
- the related art alignment method by rubbing has a problem in that if the micro-grooves formed on the surface of the alignment film are defective, phase distortion and light scattering may occur, which undesirably degrades the performance of the LCD device.
- rubbing causes the generation of dust and static electricity on the alignment film, which undesirably degrades a production yield and damages the substrate.
- a large-scale heavy rubbing roll must be used for rubbing the corresponding large substrate, and in such case, it is quite difficult to perform proper rubbing on the entire surface of the substrate with the rubbing roll applying a uniform pressure.
- the present invention is directed to an LCD device and a fabrication method thereof that substantially obviate one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide an alignment film for an LCD device without performing a rubbing process.
- Another object of the present invention is to provide a self-arranging organic alignment film for an LCD device.
- a method for fabricating an alignment film includes: providing a substrate; forming a plurality of region defining strips at an interval on the substrate; and forming organic alignment strips for aligning liquid crystal molecules between the region defining strips by applying an organic alignment material on the substrate.
- an alignment structure of a liquid crystal display device includes a substrate, a plurality of region defining strips disposed at intervals on the substrate, and organic alignment strips disposed between the region defining layers.
- a method for fabricating a liquid crystal display device includes: providing first and second substrates; forming a plurality of region defining strips at an interval on the first and second substrates; forming organic alignment strips between the region defining strips by applying an organic alignment material on the first and second substrates; and forming a liquid crystal panel by attaching the first and second substrates.
- a liquid crystal display device includes: first and second substrates; a plurality of region defining strips disposed at intervals on the substrates; organic alignment strips disposed between the region defining strips; and a liquid crystal layer formed between the first and second substrates.
- FIGS. 1A to 1C show sequential processes of an exemplary method for forming organic alignment strips in accordance with an embodiment of the present invention.
- FIG. 2 is a view of an arrangement of organic alignment molecules in a wide organic alignment layer.
- FIG. 3 is a plan view of a substrate with the organic alignment strips coated thereon in accordance with an embodiment of the present invention.
- Embodiments of the present invention provides an alignment film for aligning liquid crystal molecules in a predetermined direction without performing rubbing, and a method for fabricating the alignment film. More particularly, liquid crystal molecules are aligned according to chemical characteristics of the alignment film, rather than being aligned by morphological micro-grooves formed on the alignment film through a rubbing process.
- the alignment film is made of an organic material. When the organic alignment film material is coated on the substrate, a top of the chain in the organic material chemically interact with the liquid crystal molecules, and thus the liquid crystal molecules are aligned along the tops of the chains. Accordingly, to align the liquid crystal molecules in a desired direction, the tops of the chains in the organic alignment material need to be arranged in a desired direction.
- a region defining material is first coated to define regions of the organic alignment film.
- the arrangement of the chains in the organic alignment material, which interact with the liquid crystal molecules, is determined depending on the size of the regions coated by the organic alignment material.
- the region defining material and an organic alignment layer are alternately formed on the substrate as strips extending in an alignment direction to thereby arrange the organic alignment material in the alignment direction and to align the liquid crystal molecules in the alignment direction.
- the region defining material and the organic alignment material have opposite hydroscopic characteristics. More particularly, the region defining material is hydrophilic while the organic alignment material is hydrophobic. Thus, they are self-assembled monolayer materials that form strips with a pre-set width by themselves as a result of repulsing each other when the organic alignment material is subsequently provided on the region defining material.
- the organic alignment material in embodiments of the present invention can be N-(3-(trimethylsilyl)propyl)isonicotinamide whose chemical formula is as follows:
- the pyridine group at the top of the chains interact with liquid crystal molecules for alignment thereof.
- the liquid crystal molecules are aligned along the alignment direction of the pyridine group at the tops of the organic chain.
- the organic alignment material also contains a hydrophobic group, such as a trimethylsil group, that is used to form the organic alignment film as a series of alignment strips on the substrate in a self-arranged manner.
- a hydrophobic group such as a trimethylsil group
- FIGS. 1A to 1C show sequential processes of an exemplary method for forming an organic alignment film in accordance with an embodiment of the present invention.
- the method for forming the organic alignment film will be described in more detail with reference to FIGS. 1A to 1C .
- a region defining material 124 is coated on convex portions 122 a , which are at regular intervals, of a mold 122 .
- One of the convex portions 122 a of the mold 122 has the width of about 1 ⁇ 20 nm, and is spaced apart from an adjacent one of the concave portions 122 a by about 1 ⁇ 20 nm.
- a n-mercaptopentadecanoic acid can be used as the region defining material 124 .
- the n-mercaptopentadecanoic acid includes a mercapto group and carboxyl group.
- the carboxyl group has a hydrophilic property, as shown in the following chemical formula: HOOC CH 2 ) n —SH [Chemical formula 2] wherein ‘n’ is 1 ⁇ 30.
- the region defining material 124 is transferred onto the substrate 120 to form region defining strips 125 on the substrate 124 .
- a deposition method using the mold 122 having the micro-convex portions is called a micro-contact printing process. Since the convex portion 122 has a width of about 1 ⁇ 20 nm, the region defining strips 125 formed on the substrate 120 also have a width of about 1 ⁇ 20 nm.
- the n-mercaptopentadecanoic acid for forming the region defining layer 125 is coated such that carboxyl group with hydrophilic characteristics at the top surface.
- the organic alignment material such as ((trimethylsilyl)propyl)isonicotinamide
- the hydrophobic trimethylsilyl group of the ((trimethylsilyl)propyl)isonicotinamide and the hydrophilic carboxyl group of the n-mercaptopentadecanoic acid repulse each other, causing the organic alignment strips 126 to be formed only between the region defining strips 125 .
- the substrate 120 can be either showered with ((trimethylsilyl)propyl)isonicotinamide or submerged in ((trimethylsilyl)propyl)isonicotinamide) to form the organic alignment strips 126 only between the region defining strips 125
- the region defining strips 125 are provided at an interval of about 1 ⁇ 10 nm on the substrate 120 .
- the organic alignment strips 126 between the region defining strips 125 also have a width of about 1 ⁇ 10 nm. Accordingly, the organic alignment strips 126 are positioned between the region defining strips 125 because of the hydrophilic characteristic of the region defining strips and hydrophobic characteristic of the organic alignment material. Thus, the organic alignment strips 126 self-arrange themselves between the region defining strips 125 .
- the ((trimethylsilyl)propyl)isonicotinamide together with and n-mercaptopentadecanoic acid can be considered a self-assembled mono layer (SAM) material.
- SAM self-assembled mono layer
- n-mercaptopentadecanoic acid can be called a primary SAM material and ((trimethylsilyl)propyl)isonicotinamide can be called a secondary SAM material.
- the ((trimethylsilyl)propyl)isonicotinamide molecules positioned between the region defining strips 125 includes a propyl group at one end of the ((trimethylsilyl)propyl)isonicotinamide molecules adjacent to the substrate 120 and a pyridine group positioned at the other end of the ((trimethylsilyl)propyl)isonicotinamide molecules adjacent to the top surface of the organic alignment layer.
- the liquid crystal molecules interact with the pyridine groups so as to align themselves in the same direction as the organic alignment strips 126 are arranged between the region defining strips 125 . In other words, the pyridine groups in the organic alignment strips 126 align the liquid crystal molecules. As shown in FIG.
- the molecules of ((trimethylsilyl)propyl)isonicotinamide positioned between the region defining strips 125 are arranged such that the pyridine groups 126 a at one end of the ((trimethylsilyl)propyl)isonicotinamide molecules are at a top surface of the organic alignment strips 126 and the other end of the ((trimethylsilyl)propyl)isonicotinamide molecules are adjacent to the substrate 120 .
- FIG. 2 is a view of an arrangement of organic alignment molecules in a wide organic alignment layer.
- the ((trimethylsilyl)propyl)isonicotinamide molecules will lie on their sides or be irregularly distributed in a destabilized energy state. Since the pyridine groups of the ((trimethylsilyl)propyl)isonicotinamide molecules are not at the top surface of organic alignment layer, the liquid crystal molecules will interact with the pyridine groups of the ((trimethylsilyl)propyl)isonicotinamide molecules and thus not align the liquid crystal molecules along the organic alignment strips 126 .
- the interval between the region defining strips 125 is 1 ⁇ 20 nm such that the ((trimethylsilyl)propyl)isonicotinamide molecules are arranged at a stabilized energy state, and pyridine groups 126 a at one end of the ((trimethylsilyl)propyl)isonicotinamide molecules are at the top surface of the organic alignment strips 126 and the other end of the ((trimethylsilyl)propyl)isonicotinamide molecules are adjacent to the substrate 120 . Accordingly, since the pyridine groups are arranged at the top surface of the organic alignment strips 126 , the liquid crystal molecules can interact with the pyridine groups so as to be aligned in the same direction as the region defining strips 125 are arranged.
- FIG. 3 is a plan view of a substrate with the organic alignment strips coated thereon in accordance with an embodiment of the present invention.
- the region defining strips 125 and the organic alignment layers 126 are formed on the substrate 120 .
- the region defining strips 125 of n-mercaptopentadecanoic acid and the organic alignment strips 126 of ((trimethylsilyl)propyl)isonicotinamid are alternately formed on the substrate 120 , and their widths (‘a’ and ‘b’) are about 1 ⁇ 20 nm, respectively.
- the direction of the region defining layers 125 and the organic alignment strips 126 is the alignment direction for the liquid crystal molecules. By changing the direction of the region defining layers 125 and the organic alignment strips 126 , the alignment direction of liquid crystal molecules can be changed.
- the substrate 120 can be a thin film transistor (TFT) substrate with a driving element array, such as an array of TFTs, formed thereon or a color filter substrate with a color filter layer formed thereon.
- TFT substrate includes a plurality of gate lines and a plurality of data lines defining pixels therebetween.
- a TFT a pixel electrode is formed in each pixel, so that when the TFT is turned on, an image signal is applied to the pixel electrode.
- a color filter layer for implementing colors to be actually displayed can be formed on the color filter substrate.
- Organic alignment strips 126 can be formed on one of or both the TFT substrate and on the color filter substrate.
- the TFT substrate and the color filter substrate are attached with a liquid crystal layer therebetween such that the LCD device is fabricated.
- liquid crystals can be injected into the unit liquid crystal panel to form the liquid crystal layer.
- liquid crystal materials can be dropped onto at least one of the TFT substrate and the color filter substrate having a plurality of liquid crystal panels formed, and then, the two substrates are attached to make the liquid crystals spread between the TFT substrate and the color filter substrate, which are then divided into unit liquid crystal panels.
- the alignment direction of organic alignment strips 126 on one of the substrates can be perpendicular or parallel with the organic alignment strips 126 on the other of the substrates. each other on the TFT substrate or the color filter substrate.
- the liquid crystal molecules can be aligned in the same direction as the orientation of the organic alignment layers between the region defining strips 125 .
- the arrangement direction of the organic alignment material is not defined by itself, but rather by the region defining strips 125 .
- the organic alignment material aligns the liquid crystal molecules interacting with them, in order to arrange the organic alignment material in the predetermined direction (namely, in the upward direction), the region defining material is also required.
- the region defining material substantially helps to align the liquid crystal molecules, it can be considered as an auxiliary alignment material for aligning the liquid crystal molecules.
- the n-mercaptopentadecanoic acid can be regarded as a primary alignment material while (trimethylsilyl)propyl)isonicotinamide can be regarded as a secondary alignment material.
- any organic compound can be applied in embodiments of the present invention so long as it has the region defining material containing a hydrophobic group and the organic alignment material containing a hydrophilic group.
- the region determining material and the organic alignment material specified as particular materials in the above-described embodiment are merely examples for explaining an embodiment of the present invention.
- Any organic compound containing the chains that can interact with the liquid crystal molecules and a hydrophilic group (or hydrophobic group) can be used as the organic alignment material, and also, any organic compound containing the hydrophobic group (or hydrophilic group) that repulses the hydrophilic group (or hydrophobic group) of the organic alignment material can be used as the region defining material.
- the LCD device having the organic alignment layer and its fabrication method in accordance with the present invention have at least the following advantages.
- the organic alignment material containing the chains for aligning liquid crystal molecules in the predetermined direction by a interaction with them is simply coated onto the substrate by using a region defining material, and thus a rubbing process does not need to be performed. Therefore, a phase distortion and light spreading that may be generated during the rubbing process can be minimized or prevented. Also, since dust or static electricity is not generated on the alignment film, degradation of a production yield or damage of the substrate can be minimized or prevented.
- the uniform alignment anchoring force or surface affixing force can be sufficiently provided by the alignment strips on the liquid crystal molecules.
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Abstract
Description
wherein ‘m’ is 1˜30. In the organic alignment material, the pyridine group at the top of the chains interact with liquid crystal molecules for alignment thereof. In other words, the liquid crystal molecules are aligned along the alignment direction of the pyridine group at the tops of the organic chain.
HOOCCH2)n—SH [Chemical formula 2]
wherein ‘n’ is 1˜30.
Claims (7)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/253,769 US8345200B2 (en) | 2005-12-30 | 2011-10-05 | Liquid crystal display device having organic alignment layer and fabrication method thereof |
US13/717,588 US8629961B2 (en) | 2005-12-30 | 2012-12-17 | Liquid crystal display device having organic alignment layer and fabrication method thereof |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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KR136172/2005 | 2005-12-30 | ||
KR20050136172 | 2005-12-30 | ||
US11/385,914 US7755731B2 (en) | 2005-12-30 | 2006-03-22 | Liquid crystal display device having organic alignment layer and fabrication method thereof |
US12/821,090 US8039063B2 (en) | 2005-12-30 | 2010-06-22 | Liquid crystal display device having organic alignment layer and fabrication method thereof |
US13/253,769 US8345200B2 (en) | 2005-12-30 | 2011-10-05 | Liquid crystal display device having organic alignment layer and fabrication method thereof |
Related Parent Applications (1)
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US8629961B2 (en) * | 2005-12-30 | 2014-01-14 | Lg Display Co., Ltd. | Liquid crystal display device having organic alignment layer and fabrication method thereof |
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KR100663624B1 (en) * | 2004-04-29 | 2007-01-02 | 엘지.필립스 엘시디 주식회사 | Method for manufacturing lcd |
US8640056B2 (en) * | 2007-07-05 | 2014-01-28 | Oracle International Corporation | Data visualization techniques |
CN102629031B (en) * | 2012-04-24 | 2014-08-27 | 深圳市华星光电技术有限公司 | Method for improving PI non-stickness of substrate and PI liquid |
KR102073957B1 (en) * | 2013-09-11 | 2020-02-06 | 삼성디스플레이 주식회사 | Liquid crystal display panel and mathod for fabricating the same |
KR20150047398A (en) * | 2013-10-24 | 2015-05-04 | 삼성디스플레이 주식회사 | Display device and method for manufacturing the same |
US9659965B2 (en) * | 2014-09-12 | 2017-05-23 | Samsung Display Co., Ltd. | Liquid crystal display device and method of manufacturing the same |
KR102276994B1 (en) * | 2014-11-20 | 2021-07-13 | 삼성디스플레이 주식회사 | Liquid crystal display and method of manufacturing the same |
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CN100476550C (en) | 2009-04-08 |
US20130107183A1 (en) | 2013-05-02 |
US8629961B2 (en) | 2014-01-14 |
CN1991524A (en) | 2007-07-04 |
TW200725122A (en) | 2007-07-01 |
US7755731B2 (en) | 2010-07-13 |
TWI359320B (en) | 2012-03-01 |
US20070154655A1 (en) | 2007-07-05 |
US20100260937A1 (en) | 2010-10-14 |
KR20070072330A (en) | 2007-07-04 |
US8039063B2 (en) | 2011-10-18 |
US20120026441A1 (en) | 2012-02-02 |
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